CDK6 and granular cell tumor: Using the UCSC Xena browser, we screened the TCGA dataset of testicular GCT tissues for expression of CDK4/6 and their different isoforms in GCT tissues.36 The isoforms CDK4-201 (ENST00000257904.11) and CDK6-201 (ENST00000265734.8) seemed to be the predominantly expressed isoforms in GCT (purple) and normal testis tissue (green) (Supplementary Fig. S1A, B).